There are a number of key standards that make up the CardDAV protocol. CardDAV is based on WebDAV which is based on HTTP and it uses vCard for contact data.
The IETF has a mailing list for discussion of the CardDAV protocol.
CalConnect has a Calendar Developer Mailing List for discussion and questions amongst calendar and CardDAV developers. The link offers subscription options and a link to the archives.
The IETF has a mailing list for discussion of the CardDAV protocol.
CalConnect has a Calendar Developer Mailing List for discussion and questions amongst calendar and CardDAV developers. The link offers subscription options and a link to the archives.